• 한국전기전자재료학회:학술대회논문집
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• 한국전기전자재료학회 2005년도 하계학술대회 논문집 Vol.6
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• pp.135-138
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• 2005

HDL(Hardware Description Language) is the most important modem tools used to describe hardware, and becomes important as we move to higher levels of abstraction. The HDL has been made brisk use of in analog design, MEMS device[1-2], process related field as well as digital design. The most important characteristics of HDL is Abstraction which is the strongest tool that extend greatly designer's design ability. In this paper by the Modelling Continuum with hierarchical structure of abstraction, we apply UML(Unified Modeling Language) to SoC Design with HDL UML makes an easy and visual description of the various levels of abstraction, and gives designers good flexible modeling capabilty for SoC Design.

• 대한전기학회논문지:전력기술부문A
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• 제52권5호
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• pp.279-286
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• 2003

A new UPQC(unified power quality conditioner), which consists of series inverter, shunt inverter, dc/dc converter, and energy storage, is proposed. The proposing UPQC can compensate reactive power, harmonics, voltage sag and swell, voltage unbalance, and voltage interruption. The control strategy for the proposing UPWQC was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the EMTDC/PSCAD simulation and the experimental work with the hardware prototype. The proposing UPQC has the ultimate capability of improving power quality at the point of installation on power distribution systems or industrial power systems and can be utilized for the custom power device in the future distribution system.

• 대한전자공학회:학술대회논문집
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• 대한전자공학회 2008년도 하계종합학술대회
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• pp.401-402
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• 2008

This paper presents an efficient architecture of unified transform and quantization circuit for H.264/JPEG CODEC. The proposed unified transform circuit shares adders required for all transform operations. The proposed unified quantization circuit uses four multipliers. Our transform circuit and quantization circuit consist of 33,711 gates and 9,650 gates respectively. The maximum operating frequency is 100MHz with 130nm standard cells.

• 대한전기학회논문지:전력기술부문A
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• 제53권3호
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• pp.152-160
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• 2004

A novel UPQC(Unified Power Quality Conditioner), which consists of series inverter, shunt inverter, distributed generation system, is proposed. The proposing system can compensate reactive power, harmonics, voltage sag and swell, voltage interruption etc. through the change of paralleling operation mode and islanding operation mode. The control strategy for the proposing system was derived using the instantaneous power method. The performance of proposing system was analyzed by means of the PSCAD/EMTDC simulation and the experimental work with the hardware prototype. The proposing system has the ultimate capability of improving power quality at the point of installation on power distribution systems or Industrial power systems and can be utilized for the custom power device in th future distribution system.

• Transactions on Electrical and Electronic Materials
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• 제17권4호
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• pp.222-226
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• 2016

This paper investigated the trench process, unified field limit ring, and other products for the development of a 500 V-level unified trench gate power MOSFET. The optimal base chemistry for the device was found to be SF₆. In SEM analysis, the step process of the trench gate and field limit ring showed outstanding process results. After finalizing device design, its electrical characteristics were compared and contrasted with those of a planar device. It was shown that, although both devices maintained a breakdown voltage of 500 V, the Vth and on-state voltage drop characteristics were better than those of the planar type.

• Journal of Electrical Engineering and Technology
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• 제6권4호
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• pp.513-518
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• 2011

In this paper, a unified design environment is developed for the optimization of electric machines based on continuum sensitivity. For electromagnetic (EM) system analysis, COMSOL scripting environment is used. Optimization module is developed by MATLAB programming, which can be combined with COMSOL script commands. The modules are combined into one MATLAB project, and iteration process necessary for the optimization of EM system can be performed efficiently. During the design process, visual feedback of the current design status is given to the designer. In addition, the B-Spline parametrization of the nodal points is implemented to obtain smooth boundary of the device. The developed software is applied to the problem of finding uniform flux density distribution at the air gap of an electromagnet to verify its feasibility and effectiveness.

• 정보관리학회지
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• 제19권2호
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• pp.49-67
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• 2002

B2B 전자상거래와 같이 XML을 이용한 정보교환이 확산되고 있으며 이에 따라 상호 교환되는 정보에 대하여 체계적이며 안정적인 저장관리가 요구되고 있다. 이를 위해 XML 응용과 데이터 베이스간의 연계를 위한 다양한 연구가 이루어지고 있다. 특히 계층적 구조를 갖는 XML 파일을 다양한 형태의 데이터베이스에 저장하기 위한 데이터 모델링 방안이 요구된다. 본 논문에서는 UML을 이용한, 다양한 형태의 데이터베이스 기반의 XML 응용을 위한 통합설계 방법론을 제안한다. 이를 위하여 먼저 UML을 이용하여 W3C XML schema를 설계하기 위한 XML 모델링 방안을 제시하고, 아울러 교환되는 XML 파일을 저장 관리하기 위하여 객체-관계 데이터베이스 스키마와 객체지향 데이터베이스 스키마 그리고 관계형 데이터베이스 스키마 설계를 위한 데이터 모델링 방법을 제안한다.

• 한국콘텐츠학회논문지
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• 제15권8호
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• pp.1-8
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• 2015

아두이노는 오픈소스 기반 프로토타이핑 플랫폼으로, 미디어아트, 시뮬레이션, 인터랙션 장치 등 다양한 분야에서 활용되고 있다. 아두이노 어플리케이션은 C언어를 기반으로 개발되기 때문에 프로그램의 효과적인 설계명세 양식을 제공하지 못한다. 본 논문에서는 표준 객체지향 모델링 언어인 UML의 확장 매커니즘을 이용한 아두이노 어플리케이션 설계방법을 제안한다. 제안한 방법을 통해 아두이노 어플리케이션의 주 기능인 디지털 입출력, 아날로그 입출력 등을 UML 표기법을 이용하여 명세할 수 있다.

• 대한기계학회:학술대회논문집
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• 대한기계학회 2001년도 추계학술대회논문집A
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• pp.772-777
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• 2001

The gas-assisted injection molding process is often perceived to be unpredictable, because of the extreme sensitivity of the gas. Since a slight change in design or process parameters can significantly change the resulting gas penetration, few designers and molders have the level of experience with the new gas-assisted injection molding process required for the development of new parts. This paper is concerned with the unified molding for a thick cosmetic chest by using gas-assisted injection molding. CAE analysis was carried out to design the part and the gas channel without inducing sink marks. And based on the part weight measurement, the processing parameters to control gas penetration percentage were chosen through the method of design of experiments. A thick cosmetic chest was successfully produced using the gas assist technology. The sink mark issue associated with the conventional injection molded parts was resolved. Weight savings and cycle-time reduction were also achieved.

• 소성∙가공
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• 제10권5호
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• pp.402-410
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• 2001

The gas-assisted injection molding process is often perceived to be unpredictable, because of the extreme sensitivity of the gas. Since a slight change in design or process parameters can significantly change the resulting gas penetration, few designers and molders have the level of experience with the new gas-assisted injection molding process required for the development of new parts. This paper is concerned with the unified molding for a thick cosmetic chest by using gas-assisted injection molding. CAE analysis was carried out to design the part and the gas channel without inducing sink marks. And based on the part weight measurement, the processing parameters to control gas penetration percentage were chosen through the method of design of experiments. A thick cosmetic chest was successfully produced using the gas assist technology. The sink mark issue associated with the conventional injection molded parts was resolved. Weight savings and cycle-time reduction were also achieved.